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Electron optical apparatus, X-ray emitting device and method of producing an electron beam

a technology of electron beam and optical apparatus, applied in the direction of electrical apparatus, x-ray tube details, electric discharge tubes, etc., can solve the problems of tube size limitation, achieve the effect of short length, save space, and improve the focus of electron beam

Active Publication Date: 2010-11-23
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides an electron optical apparatus that combines the advantages of a double quadrupole lens and a thin, flat emitter. The apparatus includes a cathode with an emitter, an anode for accelerating the emitted electrons, and a magnetic dipole lens for deflecting the emitted electrons in transversal and radial directions. The apparatus has excellent focusing properties and can provide a variable focus spot position. The emitter has a planar surface for emitting electrons, which results in a reduced lateral energy component of the emitted electrons and contributes to excellent focusing properties. The apparatus can be used in electron optics for various applications such as electron microscopy and electron beam lithography.

Problems solved by technology

Additionally limitations in the tube size with an optical length of 1<130 mm have to be taken into account.
Image quality issues in CT or CV imaging require the possibility of an active control of the focal spot size during image acquisition.

Method used

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  • Electron optical apparatus, X-ray emitting device and method of producing an electron beam
  • Electron optical apparatus, X-ray emitting device and method of producing an electron beam
  • Electron optical apparatus, X-ray emitting device and method of producing an electron beam

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Embodiment Construction

[0050]The illustration in the drawing is schematically. It is noted that in different figures, similar or identical elements are provided with the same reference signs or with reference signs, which are different from the corresponding reference signs only within the first digit.

[0051]Future X-ray medical examinations have sophisticated requirements on the spot sizes and shapes in combination with fast changes in positions. Due to the limitations in space of typically 130 mm in optical length and an optimal heat management by implementing a SEC, a much better electron optic than usually used in X-ray tubes is necessary.

[0052]FIGS. 1a and 1b show an embodiment of an X-ray emitting device 1 according to the invention. The proposed X-ray emitting device to reach the above requirements comprises a cathode with a flat emitter 3 as an electron source and a lens system 5.

[0053]The objective of spot control is to create a line focus (an elongated spot) on the slanted part of an anode disc 7...

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Abstract

It is described an electron optical arrangement, a X-ray emitting device and a method of creating an electron beam. An electron optical apparatus (1) comprises the following components along an optical axis (25): a cathode with an emitter (3) having a substantially planar surface (9) for emitting electrons; an anode (11) for accelerating the emitted electrons in a direction essentially along the optical axis (25); a first magnetic quadrupole lens (19) for deflecting the accelerated electrons and having a first yoke (41); a second magnetic quadrupole lens (21) for further deflecting the accelerated electrons and having a second yoke (51); and a magnetic dipole lens (23) for further deflecting the accelerated electrons.

Description

FIELD OF THE INVENTION[0001]The present invention relates to an electron optical apparatus for producing an electron beam, to an X-ray emitting device and to a method of producing an electron beam.TECHNICAL BACKGROUND[0002]The future demands for high-end computer tomograph (CT) and cardiovascular (CV) imaging regarding the X-ray source are (1) higher power / tube current, (2) smaller focal spots combined with the ability of active control of the size, ratio and position of the focal spot, (3) shorter times for cooling down, and, concerning CT, (4) shorter gantry rotation times. In addition to this, the tube design is limited in length and weight to achieve an easy handling for CV applications and a realisable gantry setup for CT applications.[0003]One key to reach higher power and faster cooling is given by using a sophisticated heat management concept inside the X-ray tube. In conventional bipolar X-ray tubes about 40% of the thermal load of the target is due to electrons backscatter...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H01J35/30H01J35/14
CPCH01J35/14H01J35/153H01J35/147H01J35/30
Inventor HAUTTMANN, STEFANMARING, WOLFRAMHOLZAPFEL, STEFFEN
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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